Quick Answer: A.O. Smith sells its own self-contained water softener — the AO-WH-SOFT-400T (40,000 grains, about $549) and the WiFi-equipped AO-WH-SOFT-450T (45,000 grains, about $649) — exclusively through Lowe’s. But A.O. Smith Corporation is also the parent company of Hague Quality Water (dealer-only, $3,800-$10,000+ installed) and WaterBoss (big-box, under $700), both acquired in a single $44.5 million September 2017 deal and both already reviewed separately on this site. None of the three share hardware — they’re three distinct products at three distinct price tiers, sold under one ownership structure most shoppers never connect.
This site has already covered two of A.O. Smith’s water-softener brands without naming the parent company: our Hague water softener review and WaterBoss water softener review. A.O. Smith’s own directly-badged line is a third, separate product — this review covers that line, and reconciles the corporate picture connecting all three.
A.O. Smith’s own lineup at a glance
| Model | Grain capacity | Controls | Warranty | Approx. price |
|---|---|---|---|---|
| AO-WH-SOFT-400T | 40,000 grains, up to 100 gpg hardness, 10 ppm iron | 2.7" monochrome touchscreen, salt-sensing | 3-yr mechanical/electronic, 10-yr tank & cabinet | ~$549 |
| AO-WH-SOFT-450T | 45,000 grains, up to 100 gpg hardness, 10 ppm iron | 2.8" color touchscreen, WiFi salt alerts | 5-yr mechanical/electronic, 10-yr tank & cabinet | ~$649 |
The September 2017 deal that put three brands under one roof
A.O. Smith Corporation — the Milwaukee-based water heater giant — completed its acquisition of William R. Hague, Inc. (doing business as Hague Quality Water International) in September 2017, paying $44.5 million in cash plus up to a $2 million earn-out tied to future revenue growth. At the time, the Groveport, Ohio-based company employed roughly 100 people and reported about $28 million in sales for the 12 months ending June 30, 2017. The acquisition didn’t just bring over Hague’s flagship WaterMax line — Hague had, for years, also sold water-treatment hardware under two other names: WaterBoss and WaterMax. A.O. Smith inherited all of it in one transaction, then layered its own self-contained touchscreen line on top.
A.O. Smith AO-WH-SOFT-450T Smart Water Softener
- Color touchscreen shows days until next regeneration and sends a phone alert when the brine tank runs low on salt.
- Rated for up to 100 gpg hardness and 10 ppm iron — enough for most moderately hard well or city water.
- 5-year mechanical/electronic warranty is longer than the 400T's 3-year term, for roughly $100 more upfront.
Softener salt and resin on time, every time — Amazon Prime ships them free in two days, and you can try it free for 30 days.
Three brands, three tiers, not three badges on one factory
It’s worth being precise about what this ownership structure does and doesn’t mean, because this site has already documented cases where a parent company’s budget-tier badge turns out to be the exact same hardware as its premium line sold through a cheaper channel — our Kenmore review traced Kenmore-badged softeners to the same manufacturing operation behind EcoWater’s dealer-only line, and our Pentair review covers Pentair’s 1995 acquisition of Fleck. A.O. Smith’s three brands don’t appear to follow that pattern. Hague’s WaterMax uses a multi-compartment fine-mesh resin cabinet sold and installed only through authorized dealers at quote-only prices ($3,800-$10,000+ installed in 2026). WaterBoss uses a compact single-cabinet design with no separate brine tank, sold at Home Depot and Menards for under $700. A.O. Smith’s own AO-WH-SOFT line is a third design again, with its own touchscreen control system, sold exclusively through Lowe’s. The common thread is the ownership ledger, not a shared assembly line — if you’re comparing quotes or listings, the brand name tells you the distribution channel, not which factory built the tank.
Who should buy which A.O. Smith-family brand
Buy the A.O. Smith-badged AO-WH-SOFT line if you want a published price, a big-box warranty, and a touchscreen interface, and you’re comfortable with a Lowe’s purchase and DIY or independent-plumber installation. Buy WaterBoss instead if space is tight and you want the cheapest all-in-one cabinet in the family. Buy through a Hague dealer only if you specifically want an in-home water test, professional installation, and an ongoing service relationship — and are prepared to pay several times more for it. None of the three is “the real one” or a downgrade of another; they’re genuinely different products built for different buying habits, all funding the same parent company. See our water softener brands compared guide for how these three stack up against the other 25+ brands on this site.
The bottom line
A.O. Smith’s self-contained AO-WH-SOFT-400T and 450T ($549-$649, sold at Lowe’s) are a legitimate third option alongside the company’s other two water-softener brands — Hague’s dealer-only WaterMax line and WaterBoss’s big-box compacts, both already covered on this site, neither of which disclosed the A.O. Smith connection until now. Unlike this site’s Kenmore/EcoWater finding, the three aren’t the same hardware at different prices — they’re genuinely distinct products, so pick based on the install experience and price tier you want, not an assumption that one is secretly a better deal on the others’ engineering. Compare the 400T and 450T against this site’s other self-contained picks in our best water softener pillar guide.
Last updated October 7, 2026.